Note 8 - Share-based Payments (Details Textual) - Warrants [member] - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2020 |
|
| Statement Line Items [Line Items] | |||||
| Share based compensation, vesting period (Month) | 36 months | ||||
| Percentage of total equity | 4.30% | 1.40% | |||
| Expense from share-based payment transactions | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.2 | |